Improvement in mill-spindle bushes



UNITED STATES PATENT Orrioa.

HARVEY T. ASHWORTH, OF OHATHAM, VIRGINIA. p

IMPROVEMENT IN MILL-SPINDLE BUSHES.

Specification forming part of Letters Patent No. 90,463, dated May 8,.1877 application filed March 12, 1877.

To all whom it may concern Be it known that I, HARV Y T. ASHWORTH, ofGhatham, in the county of Pittsylvania and State of Virginia, haveinvented a new and Improved Millstone-Bush, of which the following is aspecification:

In the accompanying drawing, Figure 1 represents a vertical centralsection of my improved self-lubricating millstone-bush on line y y, Fig.2; and Fig. 2, a horizontal section of the same on line 00 :10, Fig. 1.

Similar letters of reference indicatecorresponding parts.

The invention relates to an improved selflubricating millstone-bush thatkeeps the spindle supplied with the necessary grease for a considerablelength of time, prevents the entrance of dust and other impurities tothe journal-bearing, and provides in an effective manner for theexpansion or contraction of the spindle.

The invention'consists of a bush for the eye of the bed-stone, which ismade of a block of hard wood or metal, and recessed for the reception ofthe cushioned journal-blocks or fob lowers, that are recessed near theupper end, and filled with a suitable lubricating mixture. The top ofthe journal-block is tightly closed by a rubber cap fitting tightlyaround the spindle.

In the drawing, A represents the spindle that passes through thebed-stone, and revolves in the bush B, of hard wood or metal, that issecured in the eye of the same.

The interior of the bush is mortised for the reception of the radiallysliding and guided journal-blocks or followers B that constitute thebearing for the spindle, and are cut with the grain of the wood at rightangles to the spindle.

Each journal-block'B has a recess, 0, cut in the upper inside part, saidrecesses opening toward the spindle, and being filled with a suitablelubricating mixture-as, for instance, beeswax and tallow-which is pouredin a melted state, through communicating top holes a of the followers Binto the recesses G. The

cushioning-pieces d, which act as springs to,

keep the blocks close to the spindle, and give way in case of expansionof the spindle by heat, insuring thereby equal wearing 'thro ughout thelength of the box. For the purpose of adjustment, after wearing by use,one. or more strips, 6, of tin or other material, are placed behind eachrubber cushion.

The journ al-blocks B are supported on radial blocks B that are insertedinto holes mortised at right angles to each other, in the same manner asthe mortises of the blocks, but e xtended through the entire thicknessof the bush B.

An indie-rubber cap, D, is attached, by a metallic binding-rim g, f, andfastening-screws, to the top of the bush, and is fitted tightly aroundthe spindle, to prevent any dust or other impurities from entering thejournalbox.

The millstonebush is of cheapand simple construction, and may be run fora considerable length of time without refilling the Inbricatingrecesses, being self lubricating and adjusting, and protected againstthe entrance of dust to the point of contact of the spindle with bush.

Having thus described my invention, I claim as new and desire to secureby Letters Patcut- The combination of the millstone-bush B, havingradial supporting-blocks B and the followers 13, having rubber cushionsd, with the spindle inclosed by the elastic dust-cap described,substantially as shown and set forth. I

HARVEY THOMAS ASHWORTH.

Witnesses:

J. G. SAUNDERS, JOHN G. DIcKnNsoN.

